Address already in use for puma-dev

Question

Problem

Whenever I try to run

bundle exec puma -C config/puma.rb --port 5000

I keep getting

bundler: failed to load command: puma (/Users/ogirginc/.asdf/installs/ruby/2.7.2/bin/puma)
Errno::EADDRINUSE: Address already in use - bind(2) for "0.0.0.0" port 5000

Tried Things

I have tried anything I can think of or read. Here is the list:

1. Good old restart the mac.

• Nope.

2. Find PID and kill.

• Run lsof -wni tcp:5000

COMMAND    PID     USER   FD   TYPE            DEVICE SIZE/OFF NODE NAME
ControlCe 6071 ogirginc   20u  IPv4 0x1deaf49fde14659      0t0  TCP *:commplex-main (LISTEN)
ControlCe 6071 ogirginc   21u  IPv6 0x1deaf49ec4c9741      0t0  TCP *:commplex-main (LISTEN)

• Kill with sudo kill -9 6071 .

• When I kill it, it is restarted with a new PID.

> lsof -wni tcp:5000
COMMAND    PID     USER   FD   TYPE            DEVICE SIZE/OFF NODE NAME
ControlCe 6071 ogirginc   20u  IPv4 0x1deaf49fde14659      0t0  TCP *:commplex-main (LISTEN)
ControlCe 6071 ogirginc   21u  IPv6 0x1deaf49ec4c9741      0t0  TCP *:commplex-main (LISTEN)

3. Use HTOP to find & kill

• Filter with puma .
• Found a match.

PID USER      PRI  NI  VIRT   RES S CPU% MEM%   TIME+  Command
661 ogirginc   17   0  390G  6704 ?  0.0  0.0  0:00.00 /opt/homebrew/bin/puma-dev -launchd -dir ~/.puma-dev -d localhost -timeout 15m0s -no-serve-public-paths

• Kill it with sudo kill -9 661 .
• Restarted with a new PID.

Additional Info

• rails version is 5.2.6 .
• puma version is 4.3.8 .
• puma-dev version is 0.16.2 .
• Here are the logs for puma-dev:

2021/10/26 09:48:14 Existing valid puma-dev CA keypair found. Assuming previously trusted.
* Directory for apps: /Users/ogirginc/.puma-dev
* Domains: localhost
* DNS Server port: 9253
* HTTP Server port: inherited from launchd
* HTTPS Server port: inherited from launchd
! Puma dev running...

It feels like I am missing something obvious. Probably, due to lack of understanding some critical & lower parts of puma-dev . I would really appreciate, if this is solved with some simple explanation. Thanks in advance! :)

Answer 1

Why

Well, this is interesting. It did not think of searching for lsof 's the COMMAND column, before.

Turns out, ControlCe is "Control Center" and with Monterey, macOS does listen ports 5000 & 7000 on default.

Solution

1. Go to System Preferences > Sharing
2. Uncheck AirPlay Receiver .
3. Now, you should be able to restart puma as usual.

Source: https://developer.apple.com/forums/thread/682332